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Hello, my name is***** sounds like you have a clogged catalytic converter. Remove front oxygen sensors completely to relieve exhaust pressure, if that allows rpm to go higher you know the converter is clogged and needs to be replaced Let me know how it goes or if you have more questions. Thanks.
With pending code next thing I'd do is swap injector with another cylinder and/or a compression test and cylinder leak down test which would test the integrity of the motor itself. Let me know how it goes or if you have more questions, thanks.
It sounds like you may have a sticking valve, I would do a running compression test next.
That could be simply from unburned fuel going into converter and igniting.
Yes it could. Let me know how the compression test goes or if you have more questions. Thanks.